Conf_iture and jcjeant,
Based on what little we know, it would be remarkable if the BEA did not ensure there was a formal investigation. It would be interesting to know the minimum vertical-g during the pitch-down, and whether anyone was hurt. IIRC, serious injury or substantial damage = accident, which would mandate an investigation. in the absence of either, it would still be bizarre for them not to publish some kind of bulletin.